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loveoceanebest3
@loveoceanebest3
June 2021
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besoin d'aide pour le dm de math svp merci beaucoup
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jujumy
Tableau : 23 -22 47-40
√ 3 3+12
√ 5
b) résoudre h(x) = -1
4x²-20x-1=-1
4x²-20x-1-(-1)=0
4x²-20x = 0
x(4x-20) = 0
x=0 ou 4x-20=0
4x=20
x=20/4 = 5
donc les antécédents de -1 sont 0 et 5
c) h(x) = -26
4x²-20x-1 = -26
4x²-20x-1-(-26) = 0
4x²-20x+25 = 0
(2x-5)² = 0
(2x-5)(2x-5)=0
2x-5 = 0
2x=5
x= 5/2
donc S =
{ 5/2 }
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b) résoudre h(x) = -1
4x²-20x-1=-1
4x²-20x-1-(-1)=0
4x²-20x = 0
x(4x-20) = 0
x=0 ou 4x-20=0
4x=20
x=20/4 = 5
donc les antécédents de -1 sont 0 et 5
c) h(x) = -26
4x²-20x-1 = -26
4x²-20x-1-(-26) = 0
4x²-20x+25 = 0
(2x-5)² = 0
(2x-5)(2x-5)=0
2x-5 = 0
2x=5
x= 5/2
donc S = { 5/2 }